Air carrier medium large transport pressurization problem noted as aircraft climbed through 30000'. Flight crew descended to 10000' and diverted to alternate for repairs.

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Attributes
ACN	89534
Time
Date	198806
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : jot
State Reference	IL
Altitude	msl bound lower : 10000 msl bound upper : 30000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau tower : bna
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 4500 flight time type : 1600
ASRS Report	89534
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Flight ord direct phl, experienced pressurization difficulty as we climbed to FL330, passing FL300, we noticed cabin altitude at 9000' and climbing slowly, we requested a lower altitude from ATC and executed a descent. ATC asked if we had a problem and if we needed assistance. We explained we had pressurization difficulty and requested a divert to pit. Upon leveling at 10000', with the pressurization under control, we then proceeded to pit followed by an uneventful landing requiring no assistance.

Original NASA ASRS Text

Title: ACR MLG PRESSURIZATION PROBLEM NOTED AS ACFT CLIMBED THROUGH 30000'. FLT CREW DESCENDED TO 10000' AND DIVERTED TO ALTERNATE FOR REPAIRS.

Narrative: FLT ORD DIRECT PHL, EXPERIENCED PRESSURIZATION DIFFICULTY AS WE CLBED TO FL330, PASSING FL300, WE NOTICED CABIN ALT AT 9000' AND CLBING SLOWLY, WE REQUESTED A LOWER ALT FROM ATC AND EXECUTED A DSCNT. ATC ASKED IF WE HAD A PROB AND IF WE NEEDED ASSISTANCE. WE EXPLAINED WE HAD PRESSURIZATION DIFFICULTY AND REQUESTED A DIVERT TO PIT. UPON LEVELING AT 10000', WITH THE PRESSURIZATION UNDER CTL, WE THEN PROCEEDED TO PIT FOLLOWED BY AN UNEVENTFUL LNDG REQUIRING NO ASSISTANCE.

Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.